Using Moonthly
Moonthly calculates the weighted average and standard deviation of your past 6 menstrual cycles. Cycles shorter than 15 days or longer than 90 days are excluded as statistical anomalies. As you log more cycles, forecast accuracy improves.
No. Moonthly is strictly a self-tracking tool. Biological cycles naturally shift with illness, hormonal changes, and lifestyle factors. Do not rely on Moonthly to avoid or achieve pregnancy. Consult a licensed medical provider for contraception.
Yes. Moonthly allows daily recording of waking temperatures to tenths of a degree and LH test strip results to help verify ovulation.
Ensure notifications are permitted for Moonthly in your device OS system settings and that the notification toggle is active in Moonthly Settings.
Privacy and Security
Exclusively on your physical smartphone inside an encrypted SQLCipher database. The decryption key resides in your device Keychain (iOS) or Keystore (Android). We have zero access to your intimate records.
Never. Moonthly contains zero advertising SDKs and does not sell or share user data with data brokers, insurers, or marketing companies.
Because your health data resides strictly on your phone, uninstalling the app permanently erases unexported records. We recommend exporting periodic backups in Settings → Privacy.
Tap "Delete All Data" in Settings → Privacy. This wipes your local database and automatically sends an API command (DELETE /api/v1/devices/me) to permanently delete your anonymous device installation ID on our server.
Premium & PDF Reports
The PDF report condenses your cycle lengths, period durations, flow intensity, and symptom frequencies into a clean clinical layout. Personal journal notes are excluded to maintain confidentiality.
Premium enables exporting your complete database as an AES-256-GCM encrypted file protected by a password you choose via PBKDF2 key derivation. Only someone with your exact password can decrypt the archive.
Navigate to Settings → Premium and tap "Restore Purchase". Make sure you are logged into the same Apple ID or Google Play account used during purchase.